JP2003503551A - Hot melt pressure sensitive positioning adhesive - Google Patents

Abstract

The present invention is a hot melt pressure sensitive positioning adhesive for use with an absorbent article. The adhesive comprises:(a) from greater than 6 to less than 15 percent by weight of the total of (a), (b) and (c) of a hydrogenated styrene-(butadiene and/or isoprene)-styrene block copolymer having a vinyl content of greater than 50% by weight; and(b) from 50 to 80 percent by weight of the total of (a), (b) and (c) of a tackifying resin which has an aromaticity such that the MMAP cloud point is at least 45° C.; and(c) from 5 to 35 percent by weight of the total of (a), (b) and (c) of a plasticizer.

Description

Detailed Description of the Invention

TECHNICAL FIELD The present invention is based on hydrogenated block copolymers of styrene and butadiene or isoprene for use in hot melt pressure sensitive positioning (A) for use with absorbent products that exhibit improved viscosity and viscosity / temperature profiles. positioning) for adhesives.

BACKGROUND OF THE INVENTION Positioning adhesives are sanitary napkins, incontinence pads, bed pads, women's pads, panty shields and diaper inserts that use an adhesive layer to attach products to supporting underwear or woven fabrics such as sheets. Used in disposable items such as. Positioning adhesive is typically applied to a release liner and transfer coated to the garment that is to be the surface of the disposable. The locating adhesive should be capable of sticking to the undergarment to hold the product in place and not move or otherwise adhere to the undergarment. Furthermore, the adhesive must not cause discoloration, damage or disturbance to the fibers of the garment.

The positioning adhesive must be a pressure sensitive adhesive that has a sticking viscosity that allows it to readily flow over and partially penetrate the particular surface to which it is applied. It must have good cohesive strength and high viscosity when the product is first placed in the undergarment, but it must also have the ability to avoid sticking over time due to temperature conditions. . Finally, the product may be used for extended periods at body temperature and may have the disadvantage that the hot melt adhesive gradually softens and penetrates the undergarment to which the product is attached. In that case, the adhesive strength becomes very high, and the adhesive strength decreases. As a result, the adhesive layer undergoes adhesive failure when the product is peeled off, and some adhesive remains on the underwear. Therefore, the prevention of such adhesive deposition on underwear is a necessary prerequisite for a well positionable hot melt adhesive composition.

Block copolymers of styrene and dienes such as butadiene or isoprene have been used for many years in positionable hot melt adhesive formulations. More recently, materials of choice in such adhesives for feminine care applications have included styrene and styrene, such as the commercially available selective hydrogenated styrene-butadiene-styrene block copolymer KRATON G1650 polymer (KRATON is a trademark). It is a selective hydrogenated block copolymer of butadiene. The term "selective hydrogenation" means predominantly hydrogenating the butadiene block. Butadiene polymerized by 1,4-addition produces "ethylene" units during hydrogenation and "butylene" by butadiene polymerized by 1,2-addition.
Units occur. Therefore, selectively hydrogenated styrene-butadiene-styrene block copolymers are commonly referred to as styrene-ethylene / butylene-styrene (SEBS) block copolymers. The amount of butadiene polymerized by 1,2-addition to the total amount of polymerized butadiene is commonly referred to as the "pre-hydrogenated vinyl content" or "butylene content". In the case of isoprene, the vinyl content before hydrogenation is the total amount of isoprene polymerized by 1,2-addition or 3,4-addition with respect to the total amount of polymerized isoprene. SEBS block copolymers used herein typically have a pre-hydrogenated vinyl content of 18 to 50% by weight. KRATON G1650 has a vinyl content before hydrogenation of about 35% by weight. Formulations based on these SEBS block copolymers have been found to have excellent adhesion to fabrics such as cotton and nylon and have the advantage of leaving no residue after peeling.
Although the sticking viscosity, that is, the melt viscosity of the preparations using these polymers is acceptable, it has a positionable adhesive preparation that can lower the use temperature by having a relatively low melt viscosity. Are considered to be advantageous. This reduces the risk of decomposition, carbide formation and filter clogging. It also provides energy and cost savings, lower maintenance costs,
The amount of odor due to volatile matter emitted from the adhesive preparation is reduced. The present invention provides such an improved positionable hot melt adhesive formulation.

SUMMARY OF THE INVENTION The present invention is a hot melt pressure sensitive positioning adhesive for use with absorbent products. The adhesive comprises a selectively hydrogenated styrene- (butadiene and / or isoprene) -styrene block co-polymer of greater than 6% and less than 15% by weight of the total of (a), (a), (b) and (c). Coalesce having a pre-hydrogenated vinyl content of greater than 50% to 90%, preferably 70-80% by weight of the total amount of butadiene and / or isoprene blocks; and (b) (a), ( 50% to 80% by weight of the total amount of b) and (c), a tackifying resin having aromaticity such that MMAP is at least 45 ° C .; and (c) (a), ( From 5% to 35% by weight of the total amount of b) and (c) is included.

The term “vinyl content before hydrogenation” refers to the conjugated diene being polymerisable by 1,2-addition (this is the case for butadiene and 3,4-in the case of isoprene). It is considered to be addition or 1,2-addition). Pure "vinyl" groups are formed only in the case of 1,2-addition polymerization of 1,3-butadiene, but the 3,4-addition polymerization of isoprene (and other The effect of similar additions on conjugated dienes) is similar. The term "vinyl" refers to the presence of pendant vinyl groups on the polymer chain prior to hydrogenation. In that case, the purpose is to introduce chain branching, reduce the size of the polymer backbone (because some of the carbons in the diene are pendant groups), and reduce the distance between the ends of the molecule, Ultimately it is to reduce its viscosity in cement.

DETAILED DESCRIPTION OF THE INVENTION One of the major components of the positioning adhesive composition of the present invention is the above hydrogen having two polystyrene end blocks and saturated or hydrogenated polybutadiene and / or polyisoprene midblock. Block copolymer. This hydrogenated basic block copolymer provides the primary load bearing capacity of the adhesive composition. It is important to hydrogenate the polymer so that the structural integrity of the polymer is preserved, even if external forces that cause degradation are applied. The block copolymer can be hydrogenated according to the methods described in the prior art, preferably to reduce at least 90% of the olefinic double bonds in the polymer chain. Suitably at least 50%, preferably at least 70%, more preferably at least 90%, most preferably at least 95% of the initial olefinic unsaturation is hydrogenated.

Polymerization of butadiene (and / or isoprene) must result in polymer blocks with high vinyl content. In that case, typically,
Anion polymerization is carried out in a non-polar solvent in the presence of a structure modifier, as is known in the art. The vinyl content before hydrogenation should be greater than 50% by weight, preferably 50-90% by weight, more preferably 70-80% by weight. If less than 50%,
The polymer viscosity is similar to conventional polymers and is ineffective. When it exceeds 90% by weight, the decrease in viscosity reaches a peak, and even if the vinyl content exceeds it, it does not decrease further. Therefore, it has no further effect.

Anionic polymerization of conjugated diene hydrocarbons with a lithium initiator is described in US Pat.
No. 39593 and Reissue Patent No. 27145, the disclosures of which are incorporated herein by reference. Polymerization is initiated by a monolithium, dilithium or polylithium initiator that builds a living polymer backbone at each lithium position. Typical living polymer structures containing polymerized conjugated diene hydrocarbons are: X-B-Li, X-A-B-Li, X-A-B-A-Li, Li-B-Y-B-Li, Li. -A-B-Y-B-A-Li. In the above, B represents polymerized units of one or more conjugated diene hydrocarbons such as butadiene or isoprene; A represents polymerized units of one or more vinyl aromatic compounds such as styrene; X represents monolithium such as sec-butyllithium. Is the residue of an initiator; Y is the residue of a dilithium initiator such as the di-adduct of sec-butyllithium and m-diisopropenylbenzene. Although structures related to polylithium initiators or some structures such as random units of styrene and conjugated dienes are known in the art, practical applications are limited.

Anionic polymerization of conjugated diene hydrocarbons is typically controlled by structure modifiers such as diethyl ether or ethyl glyme (1,2-diethoxyethane),
One obtains the desired amount of 1,2-addition (ie vinyl content). Upon polymerization at 50 ° C. with about 6 vol% diethyl ether or about 200 ppm ethyl glyme in the final solution, about 40% 1,2-addition can be obtained. About 25 in the final solution
When polymerized in the presence of 0 ppm ortho-dimethoxybenzene (ODMB), about 47% 1,2-addition can be obtained. About 300p in the final solution
During the polymerization carried out in the presence of pm of 1,2-diethoxypropane (DEP), 78% of 1,2-addition can be obtained.

Generally, the polymers useful in the present invention are suitable at temperatures typically in the range of −150 ° C. to 300 ° C., preferably in the range of 0 ° C. to 100 ° C., in the presence of structure modifiers. It can be produced by contacting a monomer or a plurality of monomers with an organic alkali metal compound in a solvent. Particularly effective polymerization initiators are organolithium compounds having the general formula RLi, where R is an aliphatic, alicyclic, alkyl-substituted alicyclic, aromatic or alkyl-substituted aromatic group having 1 to 20 carbon atoms. Is a hydrocarbon group.

Suitable solvents include those useful in solution polymerization of polymers, including aliphatic, cycloaliphatic,
Alkyl-substituted alicyclic, aromatic or alkyl-substituted aromatic hydrocarbons, ethers and mixtures thereof. Suitable solvents include aliphatic hydrocarbons such as butane, pentane, hexane and heptane; cycloaliphatic hydrocarbons such as cyclohexane and cycloheptane; alkyl substituted cycloaliphatic hydrocarbons such as methylcyclohexane and methylcycloheptane. Aromatic hydrocarbons such as benzene; alkyl-substituted aromatic hydrocarbons such as toluene and xylene; ethers such as tetrahydrofuran, diethyl ether and di-n-butyl ether.

When a polar solvent such as tetrahydrofuran is used, it is usual that no structural modifier is needed to produce the high vinyl content butadiene and / or isoprene polymer blocks.

Hydrogenation of these polymers can be accomplished by a variety of established methods such as hydrogenation in the presence of nickel catalysts such as Raney nickel, precious metal catalysts such as those containing platinum and / or palladium and soluble transition metal catalysts. It can be carried out. A suitable hydrogenation method that can be used is to dissolve the diene-containing polymer or copolymer in an inert hydrocarbon diluent such as cyclohexane, and carry out the hydrogenation by reaction with hydrogen in the presence of a soluble hydrogenation catalyst. is there. Such a method is described in US Pat.
3986, 4226952 and Reissued Patent 27145, the disclosures of which are incorporated herein by reference. The polymer is preferably less than about 1% of its original unsaturation content before hydrogenation, most preferably as low as 0%.
Hydrogenate to produce a hydrogenated polymer having a residual unsaturation content in the polydiene block of close to%. Titanium catalysts such as those disclosed in US Pat. No. 5,039,755 (herein incorporated by reference) can also be used in this hydrogenation process.

The molecular weight of the linear polymer or unarmed linear fragments such as mono-, di-, tri-blocks or the arm portion of the star polymer before coupling is conveniently determined by the GPC system using polystyrene homopolymer standards. It is measured by calibrated gel permeation chromatography (GPC) (ASTM D 3536). For anionically polymerized linear polymers, the polymer is essentially monodisperse (weight average molecular weight / number average molecular weight ratio close to 1) and it is convenient to report the "peak" molecular weight of the narrow molecular weight distribution observed. And it is enough explanation. Usually the peak value is between the number average and the weight average. Peak molecular weight is the molecular weight of the major chemical species as shown by chromatography. For polydisperse polymers, the weight average molecular weight must be calculated from chromatography and used. The material used in the GPC column is styrene-divinylbenzene gel or silica gel. The solvent is tetrahydrofuran and the detector is a refractive index detector.

As described above, the adhesive of the present invention contains more than 6% by weight and less than 15% by weight, preferably 8% by weight.
% To 11% by weight of styrene and butadiene and / or isoprene block copolymer having a vinyl content of more than 50% by weight, preferably 50% by weight to
90% by weight, more preferably 70-80% by weight. This adhesive contains more than 6% by weight of block copolymer to obtain the desired pressure sensitive adhesive properties,
Make the adhesive sufficiently tacky. The maximum amount of polymer is less than 15% by weight to keep the adhesive viscosity low enough for positioning adhesive applications. It is possible to use more than 15% of the polymer, which gives good adhesive properties but unnecessarily increases the viscosity.

The basic block copolymer must have a molecular weight and polystyrene content that make it useful for pressure sensitive adhesives. Generally, the number average molecular weight should be in the range 65,000-300000 g / mol. Its molecular weight is 6
Below 5000, the polymer loses its pressure sensitive adhesive properties. Molecular weight 3000
Above 00, the polymer is useless in adhesive applications.

The polystyrene content is preferably in the range of 10-40% by weight in order to give the polymer a good balance of tackiness and processability.

It is known that one way to characterize adhesive resin compatibility is by cloud point measurements in suitable solvent systems. From the cloud point values obtained, the resin can be characterized as aliphatic, aromatic or a combination of both, polar or non-polar, and high or low molecular weight. The idea of cloud point is a useful method for characterizing hydrocarbon resins, as hydrocarbon resins vary widely in cloud point value.

The MMAP cloud point is a known measure of aromatic solubility and determines the aliphatic / aromatic character of a resin. The lower the MMAP cloud point expressed in degrees Celsius, the higher the aromaticity of the resin. A 1: 2 mixture of methylcyclohexane and aniline is used as the solvent system in MMAP cloud point measurement. Standard weight resin is dissolved in solvent at elevated temperature and cooled with mixing. The temperature at which the resin begins to separate as a separate phase is determined and taken as the MMAP cloud point. It can be seen in the mixture as a cloud in a previously clear solution.

Suitable adhesives are compatible C5 hydrocarbon-based resins, hydrogenated C5 hydrocarbon-based resins, styrenated C5 resins, C5 / C9 resins, styrenated terpene resins, fully hydrogenated or partially hydrogenated C9 hydrocarbons. It can be selected from the group consisting of a resin, a rosin ester, a rosin derivative and a mixture thereof. The tackifying resin must have a MMAP cloud point of at least 45 ° C for the polymer / resin mixture to be compatible. Commercially available hydrocarbon tackifying resins for the present invention include PI
CCOTAC95 (MMAP = 95 ° C) aliphatic resin, REGALREZ1085
(85 ° C) or REGALREZ such as REGALREZ6108 (54 ° C)
Tackifying resins, REGALITE V-1100 (48 ° C) or REGAL
There are REGALITE tackifying resins such as ITES-260 (59 ° C.). REGALREZ 3102 resin (MMAP = 24 ° C) is not compatible with this polymer (PICCOTAC, REGAL) because a phase stable mixture cannot be obtained.
REZ and REGALITE are trademarks).

Suitable combinations of resin type, block copolymer type and concentration in the formulation are:
It must be such that an easy, fast and homogeneous mixture can be obtained. For example,
The high molecular weight SEBS block copolymer having a polystyrene content of 33% by weight and a vinyl content of 70% by weight can be easily mixed with the aliphatic hydrocarbon-based resin PICCOTAC 95 in a Z-blade mixer, and REGALITE V-11
It is possible to rapidly and homogeneously mix with 00. Homogeneous mixtures can also be obtained with hydrogenated pure aromatic resins having low levels of aromaticity, such as REGALREZ 1085.

Suitable plasticizers include paraffinic or naphthenic low aromatic content (
Carbon aromatic distribution measured according to DIN 51378 ≦ 5%, preferably ≦ 2%
, And more preferably 0%) plasticizing oil such as hydrocarbon oil. Such products are commercially available from Shell Oil Company such as SHELLFLEX, CATENEX and ONDINA oil, KAYDOL oil from Witco, or TUF from Arco.
There are also FLO oils (SHELLFLEX, CATENEX, ONDINA
And TUFFLO are trademarks). Other plasticizers include REGALREZR-1
There is a compatible liquid adhesive resin such as 018. Low molecular weight polymers such as olefinic oligomers, liquid polybutene or liquid polyisoprene (≤300
Liquid styrene / isoprene copolymer or hydrogenated styrene /
Copolymers such as isoprene copolymers, and liquid α-olefin-based polymers,
Other plasticizers such as vegetable oils and their derivatives, paraffinic and microcrystalline waxes could also be added.

It is known in the art that various other ingredients can be added, for example to change the odor and / or color of the adhesive. Antioxidants and other stabilizing ingredients can also be added to protect the adhesive from heat, light and treatment induced degradation or during storage. Several types of antioxidants can be used, such as primary antioxidants such as sterically hindered phenols or secondary antioxidants such as phosphite derivatives or mixtures thereof. An example of a commercially available antioxidant is IRGANOX 565 (2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di-tert-butylanilino) from Ciba-Geigy. −
1,3,5-triazine), IRGANOX 1010 (tetrakis-ethylene- (3,5-di-tert-butyl-4-hydroxy-hydro-cinnamate) methane) from Ciba Geigy and POLY from Uniroyal.
GARD HR (tris- (2,4-di-tert-butyl-phenyl) phosphite) and the like (IRGANOX and POLYGARD are trademarks).

The adhesive composition of the present invention typically has 100 to 10,000 cPs at 177 ° C.,
It preferably has a viscosity of 600 to 6000 cPs at 177 ° C. Adhesives typically exhibit no migration after being stripped from the fabric. This adhesive composition is
Used in products such as disposable diapers, sanitary napkins, bed pads, incontinence pads, surgical drapes, plasters and bandages.

[0026]   Example   Polymer A is a selectively hydrogenated styrene-butadiene-styrene block copolymer
With a number average molecular weight of 286,000, a polystyrene content of 33% by weight, and a vinyl content of
It has a content of 70% by weight and a polystyrene block number average molecular weight of 29000. this
Several types of hydrocarbon-based adhesive resins were evaluated using the polymer.

[0027]   Example 1   All ingredients were mixed in a Z-blade mixer. Sample in an oven at 180 ° C
I put it in a beaker. Once melted, pour the adhesive onto the Mylar sheet,
Molded to a thickness of 2 mils (50 μm). Prior to testing, sample at 23 ° C
And conditioned at 50% RH (relative humidity) for 24 hours.

Standard peel, tack and tack tests were performed on these formulations. A specific adhesion test to the fabric was performed to assess the exact functionality of the adhesive. That is, the tackiness of the positioning adhesive to the underwear was evaluated. Two reference materials were used for these tests: cotton and nylon fabric.

[0029]   The following peel adhesion tests were conducted on the fabrics.

-Initial peeling adhesive force: In the case of cotton, the initial peeling force is preferably in the range of 200 to 500 g / line inch (77 to 193 N / m).

Peel adhesion retention or aging test: sample (fabric / adhesive /
Mylar) at 40 ° C. under a load of 160 g / square inch (24.8 g / cm ² ).
Place in the oven for 8 hours. Peel adhesion is measured after 1 hour of conditioning at 23 ° C. and 50% RH. The occurrence of adhesive transfer to the fabric
Report as None or Move.

Adhesive transfer: 800 g / sample (fabric / adhesive / mylar)
Place in a 40 ° C. oven for 24 hours under a load of square inches (124 g / cm ² ).
Peel adhesion is measured after 1 hour of conditioning at 23 ° C. and 50% RH. The occurrence of adhesive transfer to the fabric is reported as "none" or "transfer".

SAFT (Shear Adhesion Failure Temperature) was measured by a 1 inch × 1 inch (2.5 × 2.5 cm) Mylar to Mylar lap joint weighing 1 kg. SAFT measures the temperature at which a lap shear assembly fails under load. Rotating sphere adhesion (RBT) is the distance a steel ball rotates on an adhesive film at standard initial velocity (pressure sensitive tape committee test number 6). Small numbers indicate strong viscosity. The holding power (HP) is a standard area (1/2 inch × 1/2 inch (1. 2 inch) from a standard test surface (steel, kraft paper) under a standard load (1 kg) with a shear of 2 °.
3 x 1.3 cm)) The time required to peel the tape off (pressure sensitive tape committee method 7). A long time means that the adhesive strength is high. The 180 ° C. peel force was measured by Pressure Sensitive Tape Committee Method 1. When the numerical value is large, the strength is high when the test tape is peeled from the steel substrate. Polyken (Po
lyken) probe adhesion (PPT) was measured by ASTM D-2979. Loop adhesion (LT) was measured using the PSTC-5 loop adhesion method. P
The high PT and LT values indicate a strong viscosity. T-peel force is measured by ASTM D-1876.

Table 1 below shows the results for G-1650, SEBS polymer with relatively low vinyl content and low molecular weight and Polymer A, the current polymers of choice for commercial positioning adhesives. PICCOTAC95 is Hercules (
Hercules) is an aliphatic hydrocarbon tackifying resin. V-1100 is a hydrogenated mixed cyclic aromatic tackifying resin manufactured by Hercules. REGAL
EZ6108 (R-6108) is a hydrogenated pure aromatic resin manufactured by Hercules. TUFFLO 6056 oil is a plasticizing oil manufactured by ARCO.

Table 1 shows the results for formulations based on polymer A in the range of 6 to 11.9 wt% polymer. In the case of 10% by weight polymer, the adhesive properties are excellent (F-4, F-6), but in the case of 6% by weight, migration of the adhesive is recognized (F-5, F-7). The hot melt viscosity decreases significantly as the amount of polymer A decreases. F-4 and F-6 have good tack and adhesion on the fabric and are higher than G-1650 reference formulation F-1.

[0036]

[Table 1]

[0037]   Example 2   In this example, the number of mixtures of various tackifying resins having different MMAP values was measured.
Phase stability was investigated using different types of block copolymers. The results are shown in Table 2 below.
is there.

[0038]

[Table 2]

[0039]   Example 3   Polymer B is a molecular parameter equivalent to the reference polymer KRATON G 1650.
However, it is a SEBS block copolymer having a high vinyl content. That po
The limer contains 30% polystyrene and the weight average molecular weight of the polystyrene block.
Is about 10,000, the total weight average molecular weight is about 107,000,
The nil content is about 75%.

Polymer C comprises 20% polystyrene, the polystyrene block weight average molecular weight is about 10,000, the total weight average molecular weight is about 140,000, and the pre-hydrogenated vinyl content is about 78%, a SEBS block. It is a copolymer.

Formulations F-8 and F-9 with a rubber content of 15.7% and a rubber content of 11.9
% Formulations F-10 and F-11 show very good adhesive properties with no adhesive transfer on the fabric after peeling. After all the viscosity is KRATON G-1650
Particularly low for polymer B, which has a high vinyl content of This indicates that the high vinyl content structure in the polymer reduces the hot melt viscosity.

[0042]

[Table 3]

[0043]   Example 4   In this experiment, the viscosity temperature profile of the high vinyl block copolymer was determined by KRA.
It was compared with that of TON G-1650. First, the viscosity is the block copolymer to be tested.
It turns out that it depends on the type of. Polymer B is actually the lowest hot melt
The viscosity is lower than that of G-1650. Then polymer C follows. Second,
The viscosity at low temperature is considerably lower than that of KRATON G-1650. This is Masa
The adhesives containing them are more easily treated at relatively low temperatures because of the desired benefits to
Can be treated.

[0044]

[Table 4]

[Procedure for Amendment] Submission for translation of Article 34 Amendment of Patent Cooperation Treaty

[Submission date] June 22, 2001 (2001.6.22)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Contents of correction]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Contents of correction]

The adhesive composition of the present invention typically has a viscosity of 100 to 10,000 mPa.s at 177 ° C.
s (cPs), preferably 600 to 6000 mPa.s at 177 ° C. It has a viscosity of s (cPs). Adhesives typically exhibit no migration after being stripped from the fabric. This adhesive composition is used in products such as disposable diapers, sanitary napkins, bed pads, incontinence pads, surgical drapes, plasters and bandages.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Contents of correction]

[0036]

[Table 1]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Contents of correction]

[0042]

[Table 3]

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) A61F 5/48 A61F 13/16 390 (81) Designated country EP (AT, BE, CH, CY, DE, DK) , ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE), OA (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR , NE, SN, TD, TG), AP (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW), EA (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CR, C U, CZ, DE, DK, DM, DZ, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR , KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, UZ, VN, YU, ZA, ZW (72) Inventor Stoner, Kyarolyn Ann USA, Texas 77053, Hewstone, Monte Carlo Rain 16506 F term (reference) 4C098 AA09 CC28 CC36 CC37 CC39 CE02 DD12 DD14 DD22 DD23 4J040 BA172 BA202 DM011 DN032 DN072 EL012 HB02 JB01 JB09 KA26 KA31 LA01 MB02 NA11

Claims (5)

[Claims] 1. A hot-melt pressure-sensitive positioning adhesive for use with absorbent products, comprising more than 6% and less than 15% by weight of the total amount of (a), (a), (b) and (c) of selective hydrogen. Styrene- (butadiene and / or isoprene) -styrene block copolymer having a vinyl content before hydrogenation of more than 50% by weight; and (b) (a), (b) and (c). 50% to 80% by weight of the total amount of the tackifying resin having aromaticity such that the MMAP cloud point is at least 45 ° C; and (c) (a), (b) and ( A hot melt pressure sensitive positioning adhesive comprising from 5% to 35% by weight of the total amount of c) of a plasticizer. 2. The vinyl content of the block copolymer before hydrogenation is 70.
% To 80% by weight. 3. The adhesive according to claim 1, containing 8 to 11% by weight of the block copolymer. 4. The hot melt adhesive according to claim 1, wherein the viscosity of the adhesive is 100 to 10,000 cPs at 177 ° C. 5. The adhesive according to claim 4, wherein the viscosity of the adhesive is 600 to 6000 cPs at 177 ° C.